package com.qk.interceptor;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
@Slf4j
@Component
public class TokenInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.获取请求路径
        String uri = request.getServletPath();
        //2.判断请求路径是否为登录路径，如果是登录路径，则放行
        if (uri.equals("/login")) {
            log.info("登录请求：{}，放行", uri);
            //放行
            return true;
        }
        //3.获取请求头token
        String jwt = request.getHeader("token");
        //4.判断token是否为空，为空则返回401
        if (jwt == null || jwt.isEmpty()) {
            log.info("请求头token不存在！");
            response.setStatus(401);
            return false;
        }

        //5.解析令牌，如果解析令牌错误，则返回401
        try {
            Claims claims = JwtUtils.parseToken(jwt);
            Integer userId = claims.get("id", Integer.class);
            log.info("当前用户id,存入ThreadLocal");
            CurrentUserHoler.setCurrentUser(userId);
        } catch (Exception e) {
            log.info("令牌解析错误！");
            response.setStatus(401);
            return false;
        }
        //6.放行
        log.info("令牌解析成功！");
        return true;
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        log.info("删除ThreadLocal中登录的当前用户信息");
        CurrentUserHoler.removeCurrentUser();
    }
}
